diff --git a/src/cameras/OrthographicCamera.js b/src/cameras/OrthographicCamera.js
index 9bc6faaa06d9ea84d5326d24356c1ee898a01775..532da017b72447a75b2b4a110912cd7f6258c0d8 100755
--- a/src/cameras/OrthographicCamera.js
+++ b/src/cameras/OrthographicCamera.js
@@ -15,10 +15,10 @@ function OrthographicCamera( left, right, top, bottom, near, far ) {
 	this.zoom = 1;
 	this.view = null;
 
-	this.left = left;
-	this.right = right;
-	this.top = top;
-	this.bottom = bottom;
+	this.left = ( left !== undefined ) ? left : - 1;
+	this.right = ( right !== undefined ) ? right : 1;
+	this.top = ( top !== undefined ) ? top : 1;
+	this.bottom = ( bottom !== undefined ) ? bottom : - 1;
 
 	this.near = ( near !== undefined ) ? near : 0.1;
 	this.far = ( far !== undefined ) ? far : 2000;